| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun pl] force | 24 |
|
| 2 | [prep] a [noun pl] [pron] | 12 |
|
| 3 | [prep] a force [pron] | 9 |
|
| 4 | a [noun pl] force [pron] | 5 |
|
